metuloidBot.|ˈmɛtjuːlɔɪd| [f. L. mētula a small pyramid (dim. of meta n.1) + -oid.] (See quot.) 1900Jackson Gloss.Bot. Terms, Metuloids, modified cystidia, encrusted with lime, which project from the hymenium of Peniophora, giving it a velvety appearance.